CN109047649B - Graphite casting mold for improving titanium alloy casting mold filling performance and preparation method thereof - Google Patents
Graphite casting mold for improving titanium alloy casting mold filling performance and preparation method thereof Download PDFInfo
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- CN109047649B CN109047649B CN201811202645.8A CN201811202645A CN109047649B CN 109047649 B CN109047649 B CN 109047649B CN 201811202645 A CN201811202645 A CN 201811202645A CN 109047649 B CN109047649 B CN 109047649B
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- graphite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
Abstract
The invention belongs to the technical field of titanium alloy casting, and particularly relates to a graphite casting mold for improving the filling performance of titanium alloy casting and a preparation method thereof. The preparation method comprises the steps of preparing a graphite casting mold test piece, preparing coating slurry, coating the coating slurry and roasting the casting mold. The graphite casting mold suitable for titanium alloy casting is obtained by coating slurry with specific components and proportions on each part of a graphite casting mold test piece. The invention can obviously improve the mold filling performance of titanium alloy graphite casting mold casting, realize the perfect mold filling of a test piece with the wall thickness of 2.5mm, and improve the mold filling capacity by 50 percent; the stability of the coating slurry is good, the cost is low, and the inertia is good; the prepared coating has high bonding strength with the casting mold, is not easy to fall off and has good surface quality; the coating and the titanium alloy are not easy to react, the surface has no cold shut defect, and the control of no inclusion in the casting can be realized.
Description
Technical Field
The invention belongs to the technical field of titanium alloy casting, and particularly relates to a graphite casting mold for improving the filling performance of titanium alloy casting and a preparation method thereof.
Background
The titanium alloy has the excellent performances of small density, high specific strength, good corrosion resistance, small linear expansion coefficient, excellent high-temperature and low-temperature mechanical properties, good biocompatibility and the like, is a high-quality structural material, is a novel functional material and an important biological implantation material, and is widely applied to the fields of aerospace, ships, chemical engineering, metallurgy, automobiles, sports, biomedicine and the like. The casting technology of the titanium alloy machine-graphite casting mold has the characteristics of high dimensional precision, good refractoriness, high casting mold strength, short production period and the like, so that the casting technology is generally adopted by most domestic casting plants. With the application and development of numerical control machining technology and hot isostatic pressing technology, a numerical control machining program is automatically generated through three-dimensional modeling, and a large-scale complex graphite casting mold can be rapidly and accurately manufactured. However, the graphite has high thermal conductivity and high cooling speed, so that the problem of poor mold filling performance is caused, and the application of the machining graphite type casting process method in large-scale complex thin-wall titanium alloy castings is limited. Therefore, the research on the method for improving the casting and filling performance of the titanium alloy graphite casting mold can obviously improve the technical level and the application range of the titanium alloy casting process and meet the urgent demand of military products on the improvement of the titanium alloy casting technology.
Disclosure of Invention
Technical problem to be solved
The invention provides a graphite casting mold for improving the filling performance of titanium alloy casting and a preparation method thereof, and aims to solve the technical problem of how to improve the filling performance of titanium alloy casting.
(II) technical scheme
In order to solve the technical problem, the invention provides a preparation method of a graphite casting mold for improving the filling performance of titanium alloy casting, which comprises the following steps:
s1, preparing a graphite casting test piece: preparing a graphite casting test piece by adopting a machining graphite casting method, and degassing the graphite casting test piece;
s2, preparing coating slurry: adding deionized water in 0-20 wt% and latex in 3-25 wt% into silica sol in 35-70 wt%; after being uniformly mixed, the mixture of calcium zirconate and yttrium oxide with the mass percent of 20-60 percent is added, wherein the calcium zirconate accounts for 5-35 percent of the mass percent of the yttrium oxide; adding 0.1-2% of penetrating agent EA and 0.1-2% of active polysiloxane water;
s3, coating slurry: adjusting the viscosity of the coating slurry to be 5-15 s by using a No. 5 Chuanyn cup, and stirring the slurry for not less than 12 h; the first coating is carried out by adopting a spraying method, the second coating is carried out by adopting a brushing method, and the prepared coating slurry is uniformly coated on each part of the graphite casting test piece; drying the coating slurry of the graphite casting mold test piece; repeating the coating process after the coating slurry is fully dried and hardened;
s4, casting mold roasting: and roasting the graphite casting mold test piece coated with the coating slurry to obtain the graphite casting mold for titanium alloy casting.
Further, in step S1, the graphite mold test piece is placed in a vacuum degassing furnace for degassing.
Further, in step S2, calcium zirconate and yttrium oxide are uniformly mixed in proportion, and after electric melting, the mixture of calcium zirconate and yttrium oxide in the form of powder particles is obtained by crushing and screening.
Further, in step S2, the powdered particles of the mixture of calcium zirconate and yttrium oxide are about 320 mesh.
Further, in step S3, the coating slurry of the graphite mold test piece is dried by air drying for 10 + -2 h at a temperature of 20-26 deg.C and a humidity of 30-60%.
Further, in step S3, the coating slurry has 1 to 15 layers and a thickness of 0.8 to 20 mm.
Further, in step S4, the graphite mold test piece is baked in a vacuum degassing furnace.
Further, in step S4, the baking process is: heating to 500 ℃, preserving heat for 2-4 h, heating to 900-1000 ℃, and preserving heat for 1-4 h.
In addition, the invention also provides a graphite casting mold, which is prepared by adopting any one of the methods; wherein, the coating slurry comprises the following components in percentage by weight:
calcium zirconate and yttrium oxide mixture: 20-60% (mass percent), wherein the calcium zirconate accounts for 5-35% of the mass percent of the yttrium oxide;
silica sol: 35-70% (mass percent);
deionized water: 0-20% (mass percentage);
penetrant EA: 0.1-2% (mass percent);
active polysiloxane water: 0.1-2% (mass percent);
latex: 3-25% (mass percentage).
In addition, the invention also provides a casting method for improving the casting and filling performance of the titanium alloy graphite casting mold, the casting method adopts the graphite casting mold, and the graphite casting mold is placed into a titanium alloy smelting furnace for casting.
(III) advantageous effects
The invention provides a graphite casting mold for improving the filling performance of titanium alloy casting and a preparation method thereof. The graphite casting mold suitable for titanium alloy casting is obtained by coating slurry with specific components and proportions on each part of a graphite casting mold test piece. The invention can obviously improve the mold filling performance of titanium alloy graphite casting mold casting, realize the perfect mold filling of a test piece with the wall thickness of 2.5mm, and improve the mold filling capacity by 50 percent; the stability of the coating slurry is good, the cost is low, and the inertia is good; the prepared coating has high bonding strength with the casting mold, is not easy to fall off and has good surface quality; the coating and the titanium alloy are not easy to react, the surface has no cold shut defect, and the control of no inclusion in the casting can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a graphite casting test piece according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The embodiment provides a casting method for improving the casting and filling performance of a titanium alloy graphite casting mold, and the preparation method comprises the following steps:
s1, preparing a graphite casting test piece: preparing a graphite casting test piece by adopting a mechanical graphite casting method, wherein the size of the test piece is 80mm multiplied by 800mm multiplied by 2.5mm, 80mm multiplied by 800mm multiplied by 3.5mm, 80mm multiplied by 800mm multiplied by 4.5mm and 80mm multiplied by 800mm multiplied by 5mm (as shown in figure 1), carrying out vacuum degassing on the prepared graphite casting test piece, wherein the vacuum degree system is less than or equal to 2.0Pa in the degassing process, the degassing temperature is 900 +/-20 ℃, the heat preservation time is more than or equal to 2h, stopping a vacuum pump when the furnace is cooled to 500 ℃, and discharging the graphite casting test piece when the furnace is cooled to 300 ℃.
S2, preparing coating slurry: 100g of deionized water and 200g of latex are added into 1000g of silica sol, 1200g of a mixture of 320-mesh fused calcium zirconate and yttrium oxide is added after uniform mixing, 2g of a penetrating agent EA and 0.1g of active polysiloxane water are added, and the viscosity of the prepared coating slurry is about 12 seconds. The graphite powder is used as a coating material required by a graphite casting coating.
S3, coating slurry: adjusting the viscosity of the coating slurry to be 6s by using a No. 5 Chuanyn cup, and stirring the slurry for not less than 12 h; the first coating is carried out by adopting a spraying method, the other coatings are carried out by adopting a brushing method, and the prepared coating slurry is uniformly coated on each part of the graphite casting test piece; drying the coating slurry; and after the coating slurry is fully dried and hardened, repeating the coating process to prepare 8 layers of coatings.
S4, casting mold roasting: and (3) putting the graphite casting mold test piece coated with the coating slurry into a vacuum degassing furnace for roasting, heating to 500 ℃, preserving heat for 3 hours, heating to 950 ℃, and preserving heat for 2 hours. And taking out the graphite mold test piece at 200 ℃ to obtain the graphite mold for titanium alloy casting.
S5, titanium alloy casting: and placing the roasted graphite casting mold into a titanium alloy vacuum smelting furnace for casting. The prepared titanium alloy ZTA15 test piece has good filling in graphite casting mold, high smoothness and good surface quality.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A graphite casting mold preparation method for improving titanium alloy casting mold filling performance is characterized by comprising the following steps:
s1, preparing a graphite casting test piece: preparing a graphite casting mold test piece by adopting a machining graphite casting method, and degassing the graphite casting mold test piece;
s2, preparing coating slurry: adding deionized water in 0-20 wt% and latex in 3-25 wt% into silica sol in 35-70 wt%; after being uniformly mixed, the mixture of calcium zirconate and yttrium oxide with the mass percent of 20-60 percent is added, wherein the calcium zirconate accounts for 5-35 percent of the mass percent of the yttrium oxide; adding 0.1-2% of penetrating agent EA and 0.1-2% of active polysiloxane water;
s3, coating slurry: adjusting the viscosity of the coating slurry to be 5-15 s by using a No. 5 Chuanyn cup, wherein the slurry stirring time is not less than 12 h; the first coating is carried out by adopting a spraying method, the other coatings are carried out by adopting a brushing method, and the prepared coating slurry is uniformly coated on each part of the graphite casting mold test piece; drying the coating slurry of the graphite casting mold test piece; repeating the coating process after the coating slurry is fully dried and hardened; drying the coating slurry of the graphite casting mold test piece in an air drying mode for 10 +/-2 hours at the drying temperature of 20-26 ℃ and the humidity of 30-60%;
s4, casting mold roasting: roasting the graphite casting mold test piece coated with the coating slurry to obtain a graphite casting mold for titanium alloy casting; wherein the roasting process comprises the following steps: heating to 500 ℃, preserving heat for 2-4 h, heating to 900-1000 ℃, and preserving heat for 1-4 h.
2. The production method according to claim 1; characterized in that, in step S1, the graphite mold test piece is placed in a vacuum degassing furnace for degassing.
3. The production method according to claim 1; the method is characterized in that in the step S2, calcium zirconate and yttrium oxide are fully and uniformly mixed according to the proportion, and after electric melting, the mixture of powdery granular calcium zirconate and yttrium oxide is obtained by crushing and screening.
4. The production method according to claim 1; characterized in that in said step S2, the powdery particles of said mixture of calcium zirconate and yttrium oxide are about 320 mesh.
5. The production method according to claim 1; the method is characterized in that in the step S3, the coating slurry has 2-15 layers, and the thickness of the coating slurry is 0.8-20 mm.
6. The production method according to claim 1; characterized in that, in the step S4, the graphite mold test piece is put into a vacuum degassing furnace to be baked.
7. A graphite casting mold, characterized in that it is produced by any one of the above-mentioned methods; the coating slurry comprises the following components in percentage by weight:
calcium zirconate and yttrium oxide mixture: 20-60% (mass percent), wherein the calcium zirconate accounts for 5-35% of the mass percent of the yttrium oxide;
silica sol: 35-70% (mass percent);
deionized water: 0-20% (mass percentage);
penetrant EA: 0.1-2% (mass percent);
active polysiloxane water: 0.1-2% (mass percent);
latex: 3-25% (mass percentage).
8. A casting method for improving the casting and filling performance of a titanium alloy graphite mold is characterized in that the graphite mold according to claim 7 is adopted, and the graphite mold is placed into a titanium alloy smelting furnace for casting.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2797990C1 (en) * | 2022-06-20 | 2023-06-13 | Федеральное государственное унитарное предприятие "Производственное объединение "Маяк" | Composition and method of preparation of non-sticky paint for graphite foundry equipment during melting and casting of reactive metals and alloys |
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| CN110465630A (en) * | 2019-08-30 | 2019-11-19 | 北京星航机电装备有限公司 | A kind of casting method of the weak rigid titanium alloy casting of large thin-wall |
| CN113857423B (en) * | 2021-08-31 | 2023-09-08 | 宝鸡昆吾创新技术有限公司 | Adhesive for casting and preparation method thereof |
| CN113996756B (en) * | 2021-10-28 | 2022-12-02 | 华中科技大学 | Preparation method of aluminum-lithium alloy based on graphite sand casting mold and product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071764A (en) * | 2012-11-30 | 2013-05-01 | 上海大学 | CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method |
| CN107243591A (en) * | 2017-05-12 | 2017-10-13 | 上海大学 | MgO‑CaZrO3Composite shell and preparation method thereof |
| CN107266064A (en) * | 2017-05-12 | 2017-10-20 | 上海大学 | MgAl2O4‑CaZrO3Composite shell, using and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456061B (en) * | 2007-12-10 | 2010-08-11 | 洛阳双瑞精铸钛业有限公司 | Auxiliary technique capable of increasing graphite mould titanium alloy casting quality |
| CN101224488B (en) * | 2008-02-20 | 2010-06-09 | 沈阳铸造研究所 | Plumbaginous dope for Ti and Ti alloy casting |
| CN105170908A (en) * | 2015-08-21 | 2015-12-23 | 北京星航机电装备有限公司 | Preparation method for titanium alloy precision casting calcium zirconate shell of polystyrene pattern |
| CN105880464B (en) * | 2016-06-01 | 2018-02-06 | 洛阳双瑞精铸钛业有限公司 | A kind of graphite mold casting method of large-scale thin-wall titanium alloy casting |
| CN108044042A (en) * | 2017-11-23 | 2018-05-18 | 中国航发北京航空材料研究院 | A kind of titanium or titanium alloy casting graphite-based core and preparation method thereof |
-
2018
- 2018-10-16 CN CN201811202645.8A patent/CN109047649B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071764A (en) * | 2012-11-30 | 2013-05-01 | 上海大学 | CaZrO3 mold shell used for titanium and titanium alloy precision casting and preparation method |
| CN107243591A (en) * | 2017-05-12 | 2017-10-13 | 上海大学 | MgO‑CaZrO3Composite shell and preparation method thereof |
| CN107266064A (en) * | 2017-05-12 | 2017-10-20 | 上海大学 | MgAl2O4‑CaZrO3Composite shell, using and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2797990C1 (en) * | 2022-06-20 | 2023-06-13 | Федеральное государственное унитарное предприятие "Производственное объединение "Маяк" | Composition and method of preparation of non-sticky paint for graphite foundry equipment during melting and casting of reactive metals and alloys |
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| CN109047649A (en) | 2018-12-21 |
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Inventor after: Yue Chunhua Inventor after: Wang Haibo Inventor after: Li Yong Inventor before: Yue Chunhua Inventor before: Wang Haibo |